your sense of place

Photo © Glenda Simmons

Nestwatch Blog: "parasites"

What Should You Do About Bird Blow Flies in the Nest?

Bird blowflies are an unwelcome blood-feeding parasite found in the nests of many species of birds. Their presence is often blamed for nestling deaths, but there is little scientific evidence that they commonly reduce nestling survival, suggesting that their harmful effects are below a lethal threshold. What—if anything—can or should we do about them when monitoring nest boxes?

Cornell Lab of Ornithology

Cornell Lab of Ornithology